1. Occurrence of halloysite in Virtasalmi kaolin deposits and its effect on rheological properties;Al-Ani,2006
2. The granitic pegmatites of the Somero-Tammela area;Alviola,1989
3. Arhe, M., 1980. The Perheniemi carbonate rock-skarn occurrence and its geology in Iitti. Unpublished M.Sc. thesis. University of Helsinki, 116 pp. (in Finnish).
4. Proterozoic Black Shales and Aeromagnetic Anomalies in Finland;Arkimaa,2000